1960s
In 1960, he was appointed Minister of Agriculture, Forest and Industry under the newly formed Panchayat system.
In 1962, he served as Member of National Legislature and Minister of Finance and Economic Affairs. In 1963, he was appointed Chairman of the Council of Ministers and Minister of Finance, Law, Justice and General Administration. During this period he was instrumental in abolishing "Land-Birta-System" and set strategies to promote land reform by onsolidating tenancy rights of the tenants.
He was also responsible to bring "Muluki-Ain", through which he attempted to eradicate the practice of an "untouchable class" and strengthen Women's Rights to vote and other social rights and activities. To this regard he promulgated laws to protect the fundamental rights of the citizen of Nepal.
In 1966, he was appointed Prime Minister under the modified constitution of Nepal. He was responsible to expand the coverage of the constitution of 1962 and promulgated 2nd amendment to make it "people oriented".
In 1967, Thapa tendered his resignation as he found that the long tenure of One-Prime-Minister was undemocratic in the development of the country. He tendered his resignation to the Nepali people over the National Radio.
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